For the same reason that the Sun and the Moon rise and set. That's the result of Earth's rotation.
It is because of the spin of the earth
The Sun doesn't really rise and set; the Sun sits there in the center of our solar system, unmoving. It is the Earth spinning - and us with it - that makes the Sun appear to rise in the East and set in the west.
because of earths rotation, the sun does not move but earth rotates
its how the earth spins round the sun. Anonymous.
Well, that's certainly what it LOOKS like - but in truth, the Sun doesn't rise or set. It is the Earth spinning once per day that makes the Sun _appear_ to rise and set.
The Earth's rotation causes the Sun to rise in the east and set in the west every day.
Because the Earth rotates on its axis, constantly spinning.
The Sun appears to rise and set because the EARTH rotates; the Sun just stays where it is.
Looking down on the solar system, the earth rotates on its axis counter clockwise, so the sun appears to rise in the east and set in the west.
The earth rotates in a clock wise motion thus making the sun rise in the east and set in the west.
The Sun doesn't really rise and set; the Sun sits there in the center of our solar system, unmoving. It is the Earth spinning - and us with it - that makes the Sun appear to rise in the East and set in the west.